From 21c9357a189fc2964541ec731c77d52f9ce9e115 Mon Sep 17 00:00:00 2001
From: voulot_d <didier.voulot@psi.ch>
Date: Thu, 23 Jun 2016 15:01:05 +0200
Subject: [PATCH] Startup

---
 script/Emittance/emitt_dv.py | 45 ++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100755 script/Emittance/emitt_dv.py

diff --git a/script/Emittance/emitt_dv.py b/script/Emittance/emitt_dv.py
new file mode 100755
index 0000000..07e9b6b
--- /dev/null
+++ b/script/Emittance/emitt_dv.py
@@ -0,0 +1,45 @@
+################################################################################
+# s = eps * [[beta, -alpha],
+#            [-alpha, gamma]]
+# R = R(1)->(2)
+# s2 = R * s1 * RT
+#
+# s2_11 = s1_11 * R11**2 + 2 * s1_12 * R11 * R12 + s1_22 * R12**2
+#
+# A = [[R11,1**2, 2 * R11,1 * R12,1, R12,1**2],
+#      [R11,2**2, 2 * R11,2 * R12,2, R12,2**2],
+#      ...
+#      [R11,n**2, 2 * R11,n * R12,n, R12,n**2],
+# B = [s2_11,1,
+#      s2_11,2,
+#      ...
+#      s2_11,n]
+# X = [s1_11,
+#      s1_12,
+#      s1_22]
+#
+# A * X = B
+################################################################################
+import numpy as np
+
+n = 5
+bet = [1.74450, 1.34220, 0.99999, 0.71557, 0.48651]
+eps = 25.0E-6   # m.rad
+R11 = [ 0.85800,  0.71000,  0.56400,  0.42000,  0.27900]
+R12 = [ 0.44100,  0.41900,  0.39800,  0.37600,  0.35500]
+
+#A = [[1.0,2.0],[3.0,4.0],[2.0,3.0]]
+#B = [[-1.0],[-1.0],[-1.2]]
+#X = [[1.0],[-1.0]]
+
+A = []
+B = []
+for i in range(0, n):
+  A.append([R11[i]**2, 2 * R11[i] * R12[i], R12[i]**2])
+  B.append([bet[i] * eps])
+
+A = np.matrix(A)
+B = np.matrix(B)
+X = np.linalg.inv(A.T.dot(A)).dot(A.T).dot(B)
+
+print(X)